A comparison of A. mexicanum V-V intergenic length was made with D. rerio (GRCz11) and H. sapiens (GRCh38.p12). In these cases, coordinate data was obtained from ENSEMBL gff dump (54 (link)). As for X. tropicalis, we performed a new X. tropicalis IGH locus annotation based on the corresponding ENSEMBL annotation (Xenopus_tropicalis_v9.1, GCA_000004195.3), further complemented and refined with sequence data kindly provided by Sibayshi Das (2 (link)), and X. tropicalis liver RNA-seq data (SRR579561) (55 (link)) following the same methodology as for A. mexicanum.
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